What This Reference Manual Contains

This reference manual contains the following chapters:

• Implementation Defined Pragmas lists GNAT implementation-dependent pragmas, which can be used to extend and enhance the functionality of the compiler.
• Implementation Defined Attributes lists GNAT implementation-dependent attributes which can be used to extend and enhance the functionality of the compiler.
• Implementation Advice provides information on generally desirable behavior which are not requirements that all compilers must follow since it cannot be provided on all systems, or which may be undesirable on some systems.
• Implementation Defined Characteristics provides a guide to minimizing implementation dependent features.
• Intrinsic Subprograms describes the intrinsic subprograms implemented by GNAT, and how they can be imported into user application programs.
• Representation Clauses and Pragmas describes in detail the way that GNAT represents data, and in particular the exact set of representation clauses and pragmas that is accepted.
• Standard Library Routines provides a listing of packages and a brief description of the functionality that is provided by Ada's extensive set of standard library routines as implemented by GNAT.
• The Implementation of Standard I/O details how the GNAT implementation of the input-output facilities.
• Interfacing to Other Languages describes how programs written in Ada using GNAT can be interfaced to other programming languages.
• Specialized Needs Annexes describes the GNAT implementation of all of the special needs annexes.
• Compatibility Guide includes sections on compatibility of GNAT with other Ada 83 and Ada 95 compilation systems, to assist in porting code from other environments.

This reference manual assumes that you are familiar with Ada 95 language, as described in the International Standard ANSI/ISO/IEC-8652:1995, Jan 1995.